Philadelphia Mayor Michael A. Nutter called Tuesday night’s Amtrak train derailment a “disastrous mess” as officials report that six people have been confirmed dead.

While emergency responders work to make their way through the twisted metal that once was Amtrak Northeast Regional Train 188 traveling from Washington D.C. to New York, at least 150 passengers are at various hospitals in the Philadelphia area being treated for injuries, CNN reports. Six people were confirmed dead.

“It is an absolute disastrous mess,” Mayor Nutter said. “I have never seen anything like this in my life.”

The train reportedly had at least seven cars, six of which overturned during the crash. There were 238 passengers, and five crew members, on board as the train made its way North, and after the crash occurred near the Port Richmond neighborhood of Philadelphia around 9:30 p.m. on Tuesday night, surviving travelers were pulled from the wreckage bloodied and badly injured.

So far, officials do not know the cause of the derailment, and nothing indicates that the disaster was an act of terrorism.

“We do not know what happened here,” Nutter said. “We do not know why it happened.”

Surviving passengers described the moment the train started to derail as “chaos,” and cellphone images of the accident back up those claims.

First responders continue to dig through the rubble on Wednesday morning and officials continue to investigate what could have caused this tragic derailment.